Honda Civic cracked engine block leaking coolant, requires replacement due to known defect on Honda Civic

Submitted by Vehicle Owner · Jun 23, 2025
Published by RepairPal

Problem overview

Some Honda Civic owners report experiencing issues with cracked engine blocks that lead to coolant leaks, particularly in the 2006-2009 model years, which are known to have a manufacturing defect. This defect can result in overheating and potential engine failure if not addressed promptly. Honda has extended the warranty for these models for 8 years, offering free engine replacements for affected vehicles. Additionally, owners have the option of receiving free replacement engine blocks or new engines if their 2006 through 2008 Civics develop coolant leaks. To mitigate risks, it is advisable for owners to regularly monitor coolant levels, use Honda-approved coolant products, and address any signs of leakage immediately. If a cracked engine block is suspected, a professional inspection is recommended to ensure accurate diagnosis and timely repairs.

2 people reported this problem
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Honda Civic vehicles with this problem

1 model year affected
Average mileage: 165,000 miles
(165,000 - 165,000)

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